This toothed belt fits some older Formula Ford water pump drives with a 30 tooth crankshaft pulley and a 34 tooth water pump pulley (we do not carry a 34 tooth pulley). Most Formula Fords use a 1/2 inch wide belt. The 170XL037 has 85 teeth, 17" circumference, and a 0.20" tooth pitch. It is 3/8" wide. Sold individually.